Bakong-This temple is the highlight of the Roluos group. It is the largest and most interesting of the three. It is surrounded by a moat, and was one of the first Angkorian temples to use the temple mountain architecture idea. That idea was then used for hundreds of years.
It’s the first temple mountain of its style; it features five levels, with a center tower, and boasts an impressive height of 15 meters. It has a square base with five tiers. The first, or outside, enclosure (not on the plan) (900 by 700 meters, 2,953 by 2,297 feet) surrounds a moat with an embankment and causeways on four sides, which are bordered by low Naga balustrades. The second and smaller enclosure has an entry tower of sandstone and laterite in the center of each side of the wall. There were originally 22 towers inside the first enclosures. After passing through the entry tower at the east one comes to a long causeway decorated with large seven-headed serpents across a moat. Long halls on each side lie parallel to the eastern wall. They were probably rest houses for visitors. Two square-shaped brick building at the northeast and southeast corners are identified by rows of circular holes and an opening to the west. The vents in the chimneys suggest these buildings served as crematoriums. There was originally a single building of this type at the northwest and southwest corners but today they are completely ruined. On each side of the causeway just beyond the halls there are two square structures with four doors. The inscription of the temple was found in the one on the right.